RFR: JDK-8260485: Simplify and unify handler vectors in Posix signal code [v2]

[Thomas Stuefe]

On Wed, 3 Feb 2021 00:58:11 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
>> 
>>  - Make SavedSignalHandlers use C-heap for its items
>>  - Removed display-replaced-handler-logic
>>  - Feedback David
>>  - Merge
>>  - JDK-8260485-signal-handler-improvements
>
> Hi Thomas,
> 
> Still a few minor comments and queries, but overall it is looking good.
> 
> Thanks,
> David

I added a printout to print_signal_handler to print out a message if the expected handler changed. This is the same logic, somewhat abridged, applied at Xcheck:jni. 

Only here, it fires whenever we print signal handlers independently from Xcheck:jni. So it gets also displayed in hs-err files or as part of a VM.info jcmd.

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PR: https://git.openjdk.java.net/jdk/pull/2251